[vinay427]

It is required to get one in your country of residence when it expires (and licenses that are valid for life can be limited to two years), or if it is lost, stolen, or damaged. That's not what I would consider "without time limits," and certainly not what I would consider "as valid" as a local Norwegian license. It's more of an extension of the several months or year that people from any other country get.

[Symbiote]

It's no different than a local renewing the card (the license itself lasts longer than the plastic card).

That's in contrast to people from some non EEA countries who have to take a local driving test.